IETF building block in the LwM2M Ecosystem (IoT World 2017 Workshop)

IETF BUILDING BLOCKS IN THE LWM2M ECOSYSTEM

Hannes Tschofenig

ARM

The information in this presentation is public. | Copyright © 2017 Open Mobile Alliance

LwM2M Workshop, 15th May 2017, Santa Clara

IETF

www.ietf.org -- SDO developing the core Internet protocols

From network layer (IP) to application layer (HTTP)

Work happens in groups, which are clustered into areas.

Each group has a mailing list.

Open participation model: RFCs, drafts, and email discussions are public for everyone.

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

DESIGN PRINCIPLES

In “Architectural Principles of the Internet” (RFC 1958) the IAB

describes a number of design principles and, among them, is

modularity.

In RFC 7452 “Architectural Considerations in Smart Object

Networking” the IAB argued that there is not a single IoT

architecture but different design patterns and suggest to re-use

existing Internet protocols, to take the existing Internet deployment

into account and to design for change.

Considering extensibility early in the design is important, as

highlighted in RFC 6709 “Design Considerations for Protocol

Extensions”.

Did we took any of into account?

LWM2M V1.0 LAYERED ARCHITECTURE

LwM2M

Objects

CoAP

DTLS

UDP

IP

UDPSMS DTLS

SMS IP

Building

Blocks(designed

to be used

in different

environments)

Complete Framework

MAIN BUILDING BLOCKS

FOR LWM2M V1.0

CoAP DTLS Object Model

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

COAP & EXTENSIONS

Semantic of a RESTful protocol (with methods, response codes, options, security, and URI schemes defined like HTTP)

Reliable transmission optional.

Basic congestion control algorithm.

Allows for group communication using multicast.

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

Helps with transmission of larger

payloads, such as firmware images.

Useful to avoid IP fragmentation and for

payloads larger than 64KB.

CoAP

Observe mechanism to avoid

repeated polling.

Feature for reducing the notification

rate.

Block-wise Transfer

Observe

WHY RE-USE?

Less work and faster time-to-market

Code

Technical specifications

Utilize the larger expertise, and research investments

Benefit from familiarity with the concepts

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

DOES RE-USE WORK?

Performance tests for computationally demanding functionality done (such as

crypto).

Early investigations with crypto on microcontrollers have been fed into EEMBC IoT-

Secure benchmarking efforts.

Optimizations sometimes possible and useful.

Example: CoAP developed at a time when alternative was HTTP/1.1

Most of the time profiling is sufficient, see RFC 7925 “DTLS/TLS Profiles for the

Internet of Things”

Optimizations for IoT environment may be feed back into wider Internet as

well.

Example: Reduction of roundtrips and improved performance of TLS/DTLS 1.3

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

PROTOCOL STACK LWM2M V1.1(SPECULATION*)

Add

ing

Alte

rna

tive

Tra

nsport

sLwM2M

Objects

CoAP

DTLS 1.2

UDP

IP

LPWAN

(e.g. NB-IoT)

Non-IP

TLS 1.2

HTTP/2

TCP

IP

MQTT

(*): No decision about the

features of LwM2M v1.1

have been made.

LWM2M V2.0?

(WILD SPECULATION)

Latest developments:

TLS 1.3 about to be

finalized.

DTLS 1.3 chartered item for

the TLS working group.

QUIC as a new transport

protocol aiming to replace

TCP.

LwM2M

Objects

HTTP/2’

QUIC/

TLS 1.3

UDP

IP

DTLS 1.3

LPWAN

(e.g. NB-IoT)

IP

CoAP

Non-IP

LWM2M: HOW TO PARTICIPATE?

I want to contribute to the technical specification Submit new objects definitions to the OMA operated repository.

File issues with the public OMA LWM2M Github issue tracker.

Become OMA member and participate in the standardization process.

Participate in the IETF for working on building blocks

I want to write code Several open source projects are happy to receive your contributions.

Examples: ARM mbed, Leshan / Wakaama, AVSystems, …

I want to test my implementation Join an interoperability test event (PlugFest, TestFest). Info about

upcoming events can be found at the OMA testfest website.

Use available open source implementations to test against.

I want to do research Help improve IoT security by analysing the security of LwM2M as a whole

or its building blocks.

Thank You

The information in this presentation is public. | Copyright © 2017 Open Mobile Alliance

MORE INFORMATION?

The information in this presentation is public. | Copyright © 2013 Open Mobile Alliance Ltd. All rights reserved.

OMA LwM2M

version 1.0

specification

Whitepaper

about device

management

Webinar about

LwM2M protocol